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Computer Maintenance & Peripherals. Introduction the word “Computer” comes from the word “Compute”. Compute means to calculate, so computer consider being a calculative device, but nowadays uses of computer in more than 80% of different areas that are not related to arithmetic calculations. So, computer is not merely calculative device. A computer is an electronic device that manipulating data according to a list of instructions. Computers take numerous physical forms. Early electronic computers were the size of a large room, consuming as much power as several hundred modern personal computers. Today, computers can be made small enough to fit into a wrist watch and be powered from a watch battery. Society has come to recognize personal computers and their portable equivalent, the laptop computer, as icons of the information age; they are what most people think of as "a computer". However, the most common form of computer in use today is by far the embedded computer. Embedded computers are small, simple devices that are often used to control other devices - for example; they may be found in machines ranging from fighter aircraft to industrial robots, digital cameras, and even